Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number H37-0003-018 found under Ring Retaining by Harris Corp. The National Stock Number assigned to this part is 5325005981493, and the Federal Supply Class is 5325 Fastening Devices. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like H37-0003-018.